CN111447524A - Multi-frequency-division independent processing noise reduction earphone and noise reduction method thereof - Google Patents

Abstract

The invention discloses a multi-frequency independent processing noise reduction earphone and a noise reduction method. The multi-frequency independent processing noise reduction earphone comprises a rear shell, a middle cover and a front cover which are installed in sequence, and a rear shell and the middle cover are formed between the rear shell and the middle cover. At least two frequency-division cavities isolated from each other, one of which is provided with a first microphone and a first low-pass filter for low-frequency phase extraction, and one of which is provided with a third frequency-division cavity for high-frequency phase extraction. Microphone and high-pass filter; between the front cover and the middle cover, there is also a sound outlet chamber that communicates with the frequency division cavity, and the sound outlet chamber is provided with a fourth microphone and a third low-pass filter for residual mixed signals filter; the rear side of the middle cover is also provided with a first speaker and a third speaker for outputting audio, and the rear ends of the first speaker and the third speaker are respectively placed in a frequency division cavity; the first microphone, the first low-pass filter , the third microphone, the high-pass filter, the fourth microphone, the third low-pass filter, the first speaker and the third speaker are all connected to the controller.

Description

A kind of multi-frequency independent processing noise reduction earphone and noise reduction method thereof

Technical field:

The invention relates to the technical field of earphone products, in particular to a multi-frequency independent processing noise reduction earphone and a noise reduction method thereof.

Background technique:

Headphones are a pair of conversion units that accept electrical signals from a media player or receiver and convert them into audible sound waves using speakers close to the ears. Headphones, as a listening device, have been widely used in all walks of life. They have the advantages of being cheap, compact, easy to use and not disturbing others. There are several types of common headphones, such as over-the-ear, ear-hook and in-ear, with a wide variety and appearance.

The current earphones generally perform noise reduction processing to improve the sound quality. Specifically, the current earphones are generally equipped with a chamber to install a speaker, and a microphone is used to collect noise, and cooperate with a low-pass filter or a high-pass filter to filter out the noise. noise. When a low-pass filter is used, the amplitude-frequency characteristic is flat between the frequencies of 0 and f2, which can make the part of the signal lower than f2 hardly attenuated and low-pass. The IIR algorithm filter can effectively extract and reverse processing. The noise part is canceled, and the frequency part above f2 is greatly attenuated, and the IIR algorithm filter cannot extract and reverse the residual noise. When the high-pass filter is used, it is opposite to the low-pass filter, and its amplitude-frequency characteristic is flat from the frequency f1 to the ∞ frequency. It allows the frequency part of the signal higher than f1 to pass through without attenuation, while the frequency part lower than f1 will be greatly attenuated, and the algorithm filter cannot extract the noise source for reverse cancellation processing.

That is to say, the current earphones can only process high-frequency noise or low-frequency noise. When filtering out high-frequency noise, low-frequency noise will remain, and when filtering out low-frequency noise, high-frequency noise will remain. That is, it is impossible to remove and filter high-frequency noise and low-frequency noise at the same time, so that a clean music signal is output, which affects the sound quality and is not conducive to improving market competitiveness.

In view of this, the inventors propose the following technical solutions.

Invention content:

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a multi-frequency independent processing noise reduction earphone and a noise reduction method thereof.

In order to solve the above technical problems, the present invention adopts the following first technical solution: the multi-frequency independent processing noise reduction earphone includes a rear shell, a middle cover arranged on the front end of the rear shell, and a front cover installed on the front end of the middle cover , at least two frequency dividing cavities isolated from each other are formed between the back shell and the middle cover, one of which is provided with a first microphone and a first low-pass filter for low-frequency phase extraction, and one frequency dividing cavity is provided with a first microphone and a first low-pass filter for low-frequency phase extraction The body is provided with a third microphone and a high-pass filter for high-frequency phase extraction; a sound outlet chamber is also formed between the front cover and the middle cover, which is communicated with the frequency division cavity, and a sound outlet chamber is provided in the sound outlet chamber for The mixed signal filters the residual fourth microphone and the third low-pass filter; the rear side of the middle cover is also provided with a first speaker and a third speaker for outputting audio, and the rear ends of the first speaker and the third speaker are respectively placed in a In the frequency dividing cavity; the first microphone, the first low-pass filter, the third microphone, the high-pass filter, the fourth microphone, the third low-pass filter, the first speaker and the third speaker are all connected to the controller.

Further, in the above technical solution, the number of the frequency division cavities is three, which are a bass cavity, a mid-range cavity and a treble cavity, and the first microphone and the first low-pass filter are arranged in the bass cavity; the mid-range cavity is provided with a second microphone and a second low-pass filter for mid-frequency phase extraction, and the third microphone and high-pass filter are set in the high-range cavity; the middle cover The rear side is also provided with a second speaker for outputting audio, and the second speaker is in the mid-range cavity; the rear ends of the first speaker and the third speaker are respectively placed in the bass cavity and the high-pitched cavity; the second microphone and Both the second low-pass filter and the second speaker are connected to the controller.

Further, in the above technical solution, the periphery of the rear shell is provided with a first through hole, a second through hole, and a third through hole that communicate with the bass cavity, the mid-range cavity and the treble cavity, respectively. The second perforation and the third perforation are respectively provided with a first tuning net, a second tuning net and a third tuning net.

Further, in the above technical solution, the size of the mid-range cavity and the tweeter cavity are the same, and both are smaller than the size of the bass cavity.

Further, in the above technical solution, the back shell is formed with mutually isolated bass grooves, mid-range grooves and high-pitched grooves, and the bass grooves, mid-range grooves and high-pitched grooves are respectively connected with the middle cover to form the bass cavity. , a mid-tone cavity and a high-pitched cavity, and the bottoms of the bass slot, mid-tone slot and treble slot are respectively formed with a first card slot, a second card slot, and a third card slot, the first microphone, the second microphone and the third microphone are respectively inserted and fixed in the first card slot, the second card slot and the third card slot.

Further, in the above technical solution, the rear side of the middle cover is further provided with a first installation slot, a second installation slot, and a third installation slot that are isolated from each other, and the front end of the middle cover is provided with three groups respectively penetrating the first installation slot. an installation slot, a second installation slot, a first through hole, a second through hole, and a third through hole of the third installation slot, the first horn, the second horn and the third horn are respectively disposed in the first installation slot , the second installation slot, and the third installation slot.

Further, in the above technical solution, the front cover is provided with a plurality of sound outlet holes corresponding to the sound outlet chamber, and the rear side of the front cover is provided with a mounting ring, and the fourth microphone is snap-fitted to the sound outlet. in the mounting ring.

Further, in the above technical solution, the controller includes a DSP chip, which integrates a DPS module and a power management module connected to the DPS module, a register for connecting music input, and a microphone for adjusting the gain. The AGC module and several operational amplifiers; the first low-pass filter, the second low-pass filter, the high-pass filter, the third low-pass filter, the first speaker, the second speaker and the third speaker are respectively connected to an operation After the amplifier is connected to the DPS module, the first microphone, the second microphone, the third microphone, and the fourth microphone are all connected to the comparator and then connected to the DPS module; the DSP chip is integrated to control its on and off Operation and reserved port for other chip communication.

In order to solve the above-mentioned technical problems, the present invention adopts the following second technical scheme: the noise reduction method of the multi-frequency independent processing noise reduction earphone is: at least two frequency division cavities that are interchanged and isolated inside the earphone and The sound output chamber communicated with the frequency division cavity, wherein a first microphone and a first low-pass filter are arranged in the first frequency division cavity for collecting noise sources and filtering high-frequency noise, and sending high-frequency phase signals into the cavity. DSP chip; a third microphone and a high-pass filter are set in the second frequency division cavity to collect noise sources and filter low-frequency noise, and send the low-frequency phase signal to the DSP chip; After superposition, it is mixed with the music signal, and then the residual noise in the mixed signal is filtered by the fourth microphone and the third low-pass filter in the sound chamber, and finally the clean music signal is output through the speaker.

Further, in the above technical solution, the number of the frequency dividing cavity is three, wherein the third frequency dividing cavity is provided with a second microphone and a second low-pass filter for collecting noise sources and filtering high-frequency noise and noise. The low-frequency noise is used to extract the intermediate frequency phase and send it to the DSP chip. The DSP chip superimposes the phase of the input high, medium and low frequency phase signals and mixes it with the music signal.

After adopting the above-mentioned technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention overcomes the defects of the existing low-pass filter or high-pass filter technology used alone, uses the acoustic architecture design of independent frequency division, uses The algorithm extraction and integration are used to realize the mixed filter, which avoids the interference between the upper frequency bands extracted by the algorithm, ensures the output of clean music signals, and makes the present invention have strong market competitiveness.

Description of drawings:

Fig. 1 is the perspective view of the present invention;

Fig. 2 is the perspective view of another angle of view of the present invention;

Figure 3 is an exploded perspective view of the present invention;

Fig. 4 is the sectional view of the present invention;

5 is a cross-sectional view of another perspective of the present invention;

Fig. 6 is the internal structure diagram of the present invention;

Fig. 7 is the perspective view of the rear shell in the present invention;

Fig. 8 is the perspective view of the middle cover in the present invention;

Fig. 9 is the perspective view of the front shell in the present invention;

10 is a circuit diagram of the present invention;

FIG. 11 is a circuit schematic diagram of the present invention.

Detailed ways:

The present invention will be further described below with reference to specific embodiments and accompanying drawings.

As shown in Fig. 1-11, it is a multi-frequency independent processing noise reduction earphone, which comprises a rear shell 1, a middle cover 2 arranged at the front end of the rear shell 1, and a front cover 3 installed at the front end of the middle cover 2, At least two frequency division cavities isolated from each other are formed between the rear case 1 and the middle cover 2, so as to realize the acoustic structure design of independent frequency division, and one frequency division cavity is provided with a first microphone for low-frequency phase extraction 41 and the first low-pass filter 42, a frequency dividing cavity is provided with a third microphone 45 and a high-pass filter 46 for high-frequency phase extraction; a frequency dividing cavity is also formed between the front cover 3 and the middle cover 2 A sound chamber 30 that is connected to each other, the sound chamber 30 is provided with a fourth microphone 301 and a third low-pass filter 302 for filtering residual mixed signals; the rear side of the middle cover 2 is also provided with an output The first speaker 51 and the third speaker 53 of the audio frequency, the rear ends of the first speaker 51 and the third speaker 53 are respectively placed in a frequency dividing cavity; the first microphone 41, the first low-pass filter 42, the first The three microphones 45 , the high-pass filter 46 , the fourth microphone 301 , the third low-pass filter 302 , the first speaker 51 and the third speaker 53 are all connected to the controller. In the present invention, at least two frequency dividing cavities which are interchanged and isolated and a sound output chamber communicated with the frequency dividing cavity are arranged inside the earphone, wherein a first microphone and a first low-pass filter are arranged in the first frequency dividing cavity. The device is used to collect noise sources and filter high-frequency noise, and send the high-frequency phase signal to the DSP chip; a third microphone and a high-pass filter are set in the second frequency division cavity to collect noise sources and filter low-frequency noise, and send the low-frequency phase signal. The signal is sent to the DSP chip; the DSP chip superimposes the phase of the input high and low frequency phase signals and mixes it with the music signal, and then passes through the fourth microphone and the third low-pass filter in the sound chamber to filter the residual noise in the mixed signal. Filter, and finally output a clean music signal through the speaker. That is to say, the present invention uses a combination of a low-pass filter and a high-pass filter, and uses two-division (or multi-division) low-frequency and high-frequency independent units as frequency division in combination with the acoustic mechanism (ie, the frequency division cavity). The pass filter is used as the low-frequency unit for low-frequency noise extraction and reverse cancellation processing, and the high-pass filter is used for the residual noise extraction and reverse cancellation processing of the high-frequency unit to realize the function of the hybrid filter. After the phase is superimposed and mixed with the music signal, the residual noise in the mixed signal is filtered by a low-pass filter, and finally a clean music signal is output through the speaker. The invention overcomes the defects of the existing low-pass filter or high-pass filter alone, uses the independent frequency division acoustic architecture design, uses the algorithm extraction and integration to realize the hybrid filter, and avoids the interference between the upper frequency bands extracted by the algorithm , to ensure the output of clean music signal, so that the present invention has strong market competitiveness.

The number of the frequency dividing cavity is three, which are a bass cavity 101, a mid-range cavity 102 and a high-pitch cavity 103, and the first microphone 41 and the first low-pass filter 42 are arranged in the bass cavity Inside the body 101; the mid-range cavity 102 is provided with a second microphone 43 and a second low-pass filter 44 for mid-frequency phase extraction, and the third microphone 45 and the high-pass filter 46 are set in the high-frequency cavity 103 The rear side of the middle cover 2 is also provided with a second speaker 52 for outputting audio, and the second speaker 52 is in the mid-range cavity 102; the rear ends of the first speaker 51 and the third speaker 53 are respectively placed in the bass cavity 101 and the tweeter cavity 103; the second microphone 43, the second low-pass filter 44 and the second speaker 52 are all connected to the controller. In the present invention, a second microphone 43 and a second low-pass filter 44 are added, and the second microphone 43 and the second low-pass filter 44 are used for intermediate frequency phase extraction, and high and low frequency noises are filtered out, and the intermediate frequency signal is reserved for later use. The phase superposition of high, medium and low frequency phase signals is carried out through the DSP chip to ensure the quality of noise filtering.

The rear shell 1 is provided with a first through hole 11 , a second through hole 12 , and a third through hole 13 that communicate with the bass cavity 101 , the mid-range cavity 102 and the tweeter cavity 103 respectively. A first tuning net 111, a second tuning net 112, and a third tuning net 113 are respectively arranged in the second through holes 12 and the third through holes 13. Through the first tuning net 111, the second tuning net 112, the third tuning net The three-tone network 113 independently adjusts the frequencies of the bass cavity 101 , the midrange cavity 102 and the treble cavity 103 .

The size of the mid-range cavity 102 and the tweeter cavity 103 are the same, and both are smaller than the size of the bass cavity 101 , so that the frequency division processing of low frequency, intermediate frequency and high frequency can be better realized.

The rear shell 1 is formed with mutually isolated bass grooves 14, mid-voice grooves 15 and high-pitched grooves 16. The low-frequency grooves 14, mid-voice grooves 15 and high-pitched grooves 16 are respectively connected with the middle cover 2 to form the bass cavity 101. , the mid-tone cavity 102 and the high-pitched cavity 103, and the bottom of the bass slot 14, the mid-tone slot 15 and the high-pitched slot 16 are respectively formed with a first card slot 141, a second card slot 151, and a third card slot 161, so The first microphone 41 , the second microphone 43 and the third microphone 45 are respectively snap-fitted and fixed in the first card slot 141 , the second card slot 151 and the third card slot 161 , so as to ensure that the first microphone 41 and the second The stability of the assembly of the microphone 43 and the third microphone 45 is ensured, and the quality of the frequency division design is guaranteed. Further, the rear side of the middle cover 2 is also provided with a first installation groove 21, a second installation groove 22, and a third installation groove 23, which are isolated from each other. An installation slot 21, a second installation slot 22, a first through hole 24, a second through hole 25, a third through hole 26 of the third installation slot 23, the first horn 51, the second horn 52 and the third horn 53 are respectively disposed in the first installation groove 21 , the second installation groove 22 and the third installation groove 23 , so as to ensure the stability of the assembly of the first horn 51 , the second horn 52 and the third horn 53 .

The front cover 3 is provided with a plurality of sound outlet holes 31 corresponding to the sound outlet chamber 30 , and a mounting ring 32 is arranged on the rear side of the front cover 3 , and the fourth microphone 301 is snap-fitted to the mounting ring 32 . middle.

The controller includes a DSP chip 6, which integrates a DPS module 61 and a power management module 62 connected to the DPS module 61, a register 63 for connecting music input, and an AGC module for adjusting the microphone gain. 64 and several operational amplifiers 65; the first low-pass filter 42, the second low-pass filter 44, the high-pass filter 46, the third low-pass filter 302, the first speaker 51, the second speaker 52 and the third The speakers 53 are respectively connected to an operational amplifier 65 and then connected to the DPS module 61, and the first microphone 41, the second microphone 43, the third microphone 45, and the fourth microphone 301 are all connected to a comparator and then connected to the DPS module 61; The DSP chip 6 is integrated with a reserved port 66 for controlling its on and off operations and for communication with other chips.

To sum up, the present invention is provided with at least two frequency dividing cavities that are interchanged and isolated inside the earphone and a sound output chamber communicated with the frequency dividing cavity, wherein the first frequency dividing cavity is provided with a first microphone and a sound output chamber. The first low-pass filter is used to collect noise sources and filter high-frequency noise, and send the high-frequency phase signal to the DSP chip; the second frequency division cavity is provided with a third microphone and a high-pass filter to collect noise sources and filter low-frequency noise. , and send the low-frequency phase signal to the DSP chip; the DSP chip superimposes the phase of the input high and low-frequency phase signals and mixes it with the music signal, and then passes through the fourth microphone in the sound chamber and the third low-pass filter. The residual noise in the signal is filtered, and finally a clean music signal is output through the speaker. That is to say, the present invention uses a combination of a low-pass filter and a high-pass filter, and uses two-division (or multi-division) low-frequency and high-frequency independent units as frequency division in combination with the acoustic mechanism (ie, the frequency division cavity). The pass filter is used as the low-frequency unit for low-frequency noise extraction and reverse cancellation processing, and the high-pass filter is used for the residual noise extraction and reverse cancellation processing of the high-frequency unit to realize the function of the hybrid filter. After the phase is superimposed and mixed with the music signal, the residual noise in the mixed signal is filtered by a low-pass filter, and finally a clean music signal is output through the speaker. The invention overcomes the defects of the existing low-pass filter or high-pass filter alone, uses the independent frequency division acoustic architecture design, uses the algorithm extraction and integration to realize the hybrid filter, and avoids the interference between the upper frequency bands extracted by the algorithm , to ensure the output of clean music signal, so that the present invention has strong market competitiveness.

The present invention also provides a noise reduction method for multi-frequency independent processing of noise-reducing earphones. The noise reduction method is as follows: at least two frequency-division cavities are arranged inside the earphone and are connected to the frequency-division cavity. The sound chamber, wherein the first frequency division chamber is provided with a first microphone 41 and a first low-pass filter 42 for collecting noise sources and filtering high-frequency noise, and sending high-frequency phase signals into the DSP chip; the second A third microphone 45 and a high-pass filter 46 are arranged in each frequency dividing cavity to collect noise sources and filter low-frequency noise, and send the low-frequency phase signal to the DSP chip; after the DSP chip superimposes the phase of the input high and low-frequency phase signals Mixed with the music signal, the residual noise in the mixed signal is filtered through the fourth microphone 301 and the third low-pass filter 302 in the sound chamber, and finally a clean music signal is output through the speaker. The invention overcomes the defects of the existing low-pass filter or high-pass filter alone, uses the independent frequency division acoustic architecture design, uses the algorithm extraction and integration to realize the hybrid filter, and avoids the interference between the upper frequency bands extracted by the algorithm , to ensure the output of clean music signal, so that the present invention has strong market competitiveness.

The number of the frequency dividing cavity is three, and the third frequency dividing cavity is provided with a second microphone 43 and a second low-pass filter 44 for collecting noise sources and filtering high-frequency noise and low-frequency noise to extract the intermediate frequency phase. , and sent to the DSP chip, the DSP chip superimposes the phase of the input high, medium and low frequency phase signals and mixes them with the music signal. The noise reduction method for multi-frequency independent processing noise reduction earphones of the present invention also adds a second microphone 43 and a second low-pass filter 44 for collecting noise sources and filtering high-frequency noise and low-frequency noise, so as to extract the intermediate frequency phase for later passage The DSP chip superimposes the phase of the high, medium and low frequency phase signals to further ensure the quality of noise filtering.

Of course, the above descriptions are only specific embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention. Any equivalent changes or modifications made in accordance with the structures, features and principles described in the scope of the patent application of the present invention shall be included in the within the scope of the patent application of the present invention.

Claims (10)

1. The utility model provides a many frequency division independent processing noise reduction earphone which characterized in that: the high-frequency phase extraction device comprises a rear shell (1), a middle cover (2) arranged at the front end of the rear shell (1) and a front cover (3) arranged at the front end of the middle cover (2), wherein at least two mutually isolated frequency division cavities are formed between the rear shell (1) and the middle cover (2), a first microphone (41) and a first low-pass filter (42) for low-frequency phase extraction are arranged in one frequency division cavity, and a third microphone (45) and a high-pass filter (46) for high-frequency phase extraction are arranged in one frequency division cavity; a sound outlet chamber (30) communicated with the frequency division cavity is formed between the front cover (3) and the middle cover (2), and a fourth microphone (301) and a third low-pass filter (302) for filtering the mixed signal and remaining are arranged in the sound outlet chamber (30); a first loudspeaker (51) and a third loudspeaker (53) for outputting audio are further arranged on the rear side of the middle cover (2), and the rear ends of the first loudspeaker (51) and the third loudspeaker (53) are respectively arranged in a frequency division cavity; the first microphone (41), the first low-pass filter (42), the third microphone (45), the high-pass filter (46), the fourth microphone (301), the third low-pass filter (302), the first loudspeaker (51) and the third loudspeaker (53) are all connected with a controller.

2. The multi-division independent processing noise reduction headphone of claim 1, wherein: the number of the frequency division cavities is three, the frequency division cavities are respectively a bass cavity (101), a middle-tone cavity (102) and a treble cavity (103), and the first microphone (41) and the first low-pass filter (42) are arranged in the bass cavity (101); a second microphone (43) and a second low-pass filter (44) for extracting a medium-frequency phase are arranged in the middle-tone cavity (102), and a third microphone (45) and a high-pass filter (46) are arranged in the high-tone cavity (103); a second loudspeaker (52) for outputting audio is arranged on the rear side of the middle cover (2), and a middle sound cavity (102) of the second loudspeaker (52) is provided; the rear ends of the first loudspeaker (51) and the third loudspeaker (53) are respectively arranged in the bass cavity (101) and the treble cavity (103); the second microphone (43), the second low-pass filter (44) and the second loudspeaker (52) are connected with a controller.

3. The multi-division independent processing noise reduction headphone of claim 2, wherein: the periphery of the rear shell (1) is provided with a first perforation (11), a second perforation (12) and a third perforation (13) which are respectively communicated with the bass cavity (101), the middle-pitch cavity (102) and the treble cavity (103), and a first tuning net (111), a second tuning net (112) and a third tuning net (113) are respectively arranged in the first perforation (11), the second perforation (12) and the third perforation (13).

4. The multi-division independent processing noise reduction headphone of claim 2, wherein: the middle-tone cavity (102) and the high-tone cavity (103) are the same in size and smaller than the low-tone cavity (101).

5. The multi-division independent processing noise reduction headphone of claim 2, wherein: rear shell (1) shaping has low sound groove (14), well sound groove (15) and high sound groove (16) of mutual isolation, forms after this low sound groove (14), well sound groove (15) and high sound groove (16) dock with well lid (2) respectively bass cavity (101), well sound cavity (102) and high sound cavity (103), and the bottom of this low sound groove (14), well sound groove (15) and high sound groove (16) shaping respectively has first draw-in groove (141), second draw-in groove (151), third draw-in groove (161), first microphone (41), second microphone (43) and third microphone (45) inlay card are fixed in this first draw-in groove (141), second draw-in groove (151), third draw-in groove (161) respectively.

6. The multi-division independent processing noise reduction headphone of claim 2, wherein: well lid (2) rear side still is provided with first mounting groove (21), second mounting groove (22), third mounting groove (23) that mutually insulate, and this well lid (2) front end has seted up three groups backward and has link up respectively first through-hole (24), second through-hole (25), third through-hole (26) of first mounting groove (21), second mounting groove (22), third mounting groove (23), first loudspeaker (51), second loudspeaker (52) and third loudspeaker (53) set up respectively in this first mounting groove (21), second mounting groove (22), third mounting groove (23).

7. A multi-division independent processing noise reducing headphone according to any one of claims 2-5, characterized in that: the front cover (3) is provided with a plurality of sound outlet holes (31) of the sound outlet chamber (30), the rear side of the front cover (3) is provided with a mounting ring (32), and the fourth microphone (301) is installed in the mounting ring (32) in a clamping and embedding manner.

8. The multi-division independent processing noise reduction headphone of claim 6, wherein: the controller comprises a DSP chip (6), wherein a DPS module (61) and a power management module (62) connected with the DPS module (61), a register (63) used for connecting music input, an AGC module (64) used for adjusting microphone gain and a plurality of operational amplifiers (65) are integrated in the DSP chip (6); the first low-pass filter (42), the second low-pass filter (44), the high-pass filter (46), the third low-pass filter (302), the first loudspeaker (51), the second loudspeaker (52) and the third loudspeaker (53) are respectively connected with an operational amplifier (65) and then connected with the DPS module (61), and the first microphone (41), the second microphone (43), the third microphone (45) and the fourth microphone (301) are connected with a comparator and then connected with the DPS module (61); and a reserved port (66) for controlling the on and off operation of the DSP chip (6) and for communication of other chips is integrated in the DSP chip.

9. A noise reduction method of a noise reduction earphone with multiple frequency division independent processing is characterized in that: the noise reduction method comprises the steps that at least two frequency division cavities which are isolated in an exchange mode and a sound outlet cavity communicated with the frequency division cavities are arranged in an earphone, wherein a first microphone (41) and a first low-pass filter (42) are arranged in the first frequency division cavity and used for collecting a noise source and filtering high-frequency noise, and high-frequency phase signals are sent to a DSP chip; a third microphone (45) and a high-pass filter (46) are arranged in the second frequency division cavity and used for collecting noise sources and filtering low-frequency noise, and low-frequency phase signals are sent to the DSP chip; the DSP chip carries out phase superposition on the sent high-frequency phase signal and the sent low-frequency phase signal, then the high-frequency phase signal and the sent low-frequency phase signal are mixed with the music signal, residual noise in the mixed signal is filtered through a fourth microphone (301) and a third low-pass filter (302) in the sound outlet chamber, and finally the clean music signal is output through a loudspeaker.

10. The multi-division independent processing noise reduction headphone of claim 9, wherein: the number of the frequency division cavities is three, wherein the third frequency division cavity is provided with a second microphone (43) and a second low-pass filter (44) which are used for collecting noise sources and filtering high-frequency noise and low-frequency noise so as to extract intermediate-frequency phases and send the intermediate-frequency phases to the DSP chip, and the DSP chip performs phase superposition on the sent high-frequency, intermediate-frequency and low-frequency phase signals and then mixes the signals with music signals.

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